Completely Digital Interactive Book:
http://www.ted.com/talks/mike_matas.html
E-page and Conductive Ink:
http://futureperfectpublishing.com/2007/08/15/in-search-of-the-next-gutenberg/
Invisible Ink
http://www.instructables.com/id/Hollow-Book-Invisible-ink-Black-light/
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